198266879 has 2 divisors, whose sum is σ = 198266880. Its totient is φ = 198266878.

The previous prime is 198266867. The next prime is 198266899. The reversal of 198266879 is 978662891.

It is a weak prime.

It is an emirp because it is prime and its reverse (978662891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198266879 - 2⁸ = 198266623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198266819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99133439 + 99133440.

It is an arithmetic number, because the mean of its divisors is an integer number (99133440).

Almost surely, 2^198266879 is an apocalyptic number.

198266879 is a deficient number, since it is larger than the sum of its proper divisors (1).

198266879 is an equidigital number, since it uses as much as digits as its factorization.

198266879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The square root of 198266879 is about 14080.7272184358. The cubic root of 198266879 is about 583.1094191130.

The spelling of 198266879 in words is "one hundred ninety-eight million, two hundred sixty-six thousand, eight hundred seventy-nine".